Roll-grinding apparatus



April 6 192e. 1,579,932

l.. R; HEIM ROLL GRINDING APPARATUS @51g bkom/m s 6%. www@ @Qui/YW April 6, 1926. 1,579,932

L. R. HEIM ROLL GRINDING APPARATUS original Filed Dec. 21, 1920 2 sheds-sheet 2 Shoe-nto@ @51j @wom/Le Patented Apr. c, 1926.

UNITED jsTATEs PATENT oFFlcE.

LEWIS R. HEIM, OF DANBURY, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 THE HEIM GRINDER CQMPANY, OF DANBURY, CONNECTICUT, A CORPORATION Ol' CONNECTICUT.

ROLL-GRINDING APPARATUS.

Application led December 21, 1920, Serial No. 432,175, Renewed Hay 6, 1925. i

To all 'whom t may concern:

Be it known that I, LEwIs R. HEIM, a citizen of the United States, and a resident of Danbury, in the county of Fairfield .and

State of Connecticut, have invented anImprovement in Roll-Grinding Apparatus, of which the following is a specification.

This invention relates to grinding machines and more particularly toapparatus for grinding rolls.

An object of this invention is to provide roll grinding apparatus of efficient action and of durable construction.

This invention aims also to provide an improved roll grinding apparatus comprising a durable work rest or carrier for rolls having great flexibility of adjustment with respect to the operating surfaces of the abrasive wheels and capable of convenient adjustment thereof to compensate for wear imposed thereon by the work or rolls.

Another object is to provide a roll grinding apparatus of the above type in which the harmful effect of wear and `friction of the rolls on the carrier may be reduced or eliminated.

Other objects willJ be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in.

the features of construction, arrangement of parts and combinations'of elements as will le exemplified inthe structure hereinafter described and shown in the accompanying drawings and the scope of the application of which will be indicated in the appended claims. v One of various possible embodiments of this invention is illustratively shown in the drawings, wherein Figure 1 is a plan view, and Y Fi ure 2 is a front elevation of the roll grin( ing apparatus, the rearwardly extending portions of the several parts not being shown in nFigure 2.

Figure 3 is a side view on an enlarged scaleof the roll carrier or work rest, and

Figure 4 is a sectional view taken on the line 4-4 of Figure 3. Y l

referring more particularly to Figures 1 and 2, it will be noted that there has been provided a main base or standard 1 0 upon the respective ends of which are pivotally mounted the tables 11 and l2 pivoted there-V on as by means :f the pins 13 and 14, re-

spectively, indicated in dotted lines in Fig-A ure 1. The tables 11 and 12 are eachjproaA vided with a pair of slots 15 and 16, respectively, through which extend the clamping screws 17 and 18, respectively, for clamping the tables 11 and 12 .to the main frame or standard 10 at any desired position to which they may be swung about theirI pivot The table -11 is provided with ways'19, in which is slidablymounted the bearing frame 20 which supports the bearings 21 and 22. Housed in the bearin 23 upon one end` of w ich is mounted 'a suitable chuck 24, in which is adapted to be secured inany convenient manner an abrasive wheel 25, the shaft 23 having mounted upon its other end a collar 26 to prevent axial movement thereof. A cured to the shaft 23 intermediate the bearings 21 and 22 serves to transmit rotation to the abrasive wheel 25 from any suitable- 21 and 22 is a shaft,

pulley 27 sebearing frame 2O may be moved longitudinally of the ways 19 and may be clamped in any desired adjusted position'by meansv of the clamping bolts 28.

Upon the pivotally mounted table 12 at the other end of the standard 10 a substantially similar construction is employed for mounting the abrasive'wheel 29 in operative relation to the abrasive wheel 25. This construction embodies substantially similar parts and comprises the bearing frame 30 slidably mounted in the ways 31 on the ivotally adjustable table 12, the bearing ame 30 supporting the shaft 32 in suitable bearings 21 and 22 thereon and at one end of which is mounted the chuck 33 for supporting the abrasive wheel 29. A suitable col-l lar 34 is provided upon the end of the shaft 32 to prevent axial movement thereof and a pulley 35 is mounted uponthe shaft to transmit rotation to the abrasive wheel `29.

The bearing frame 30, however, is` provided with a rack 36 facing downwardly and adapted to engage 'the pinion 37 mounted upon a shaft supported in a'suitable bearing 39 preferably integral with the table 12. A lever 39 rigidly secured to the shaft 38 has its end connected to a tension spring 40', one end of which is secured tothe standard 10 so as to urge the pinion 37 in such a rotative direction as to tend to move the rack 36 and its associated.` abrasive wheel '29 in a direction toward'the abrasive wheels to abut against the end ofthe table 12. The

screwv 40 may be manually .operated lto adjust -the wheel 29 toward or away from the wheel as desired, and to preserve the adjustment given the screw 40 there is provided a clamping screw 42 at the lower end lof the yarm 41 to clamp the screw in its adjusted-V position. A hand lever 43 rigidly se-` cured to the shaft 38 on which the pinion' 37 is mounted ipermits o f 'a manual withdrawal against the action of the sprlng 40 of the carriage and its associated Wheel 29.

To carry the rolls or parts operated upon into operative relation with the wheels 25 and 29 there is provided a carrier 44, re

ferring particularly to Figs. 3 and 4, of

e circular cross-section rotatably mounted in bearings 45 and 46 upon a main frame member 47 extending between the wheels 25 and, `29 and mounted as hereinafter descrlbed.

To guide the rolls along the carrier 44 there is provided a pair of guides 48 and 49 preferably of sheet metal bent into an angular form so as to provide base members by means of which the guides 48 and 49 may besecured, as by-means of the screws 48',

to the bracket 53. The base members of the guides 48 and 49 are provided with trans-l g versely extending slots through which the screws 48 extend so that the guides 48 and 49l may' be adj-ustably positioned with respect to \the carrier 44 to accommodate therebetween rolls of various diameters. The rolls or parts operated upon, indlcated at 51, are thus guided and carried into operative relation between the operative surfaces of the wheels 25 and 29. At one extremity ofthe frame member 47 there is `secured an inclined trough 50 vadapted to -receive the rolls 51 after operatlon upon them by the Wheels 25 and 29 in a manner to be hereinafter described and to pass the rolls into a suitable receptacle.

Theabrasive wheels 25 and 29 are preferably of annular -form and are" beveled as indicated in .Figure 1, so thatupon the properangular relation between the axes of the wheels 25 and 29 having been established by means of the pivotal adjustment of the tables 1,1 andy 12 as hereinbefore described, the adjacent operating faces of the beveledv abrasive wheels 25 and 29 will be substantially parallel and will present substantially parallel ope-rgtive portions for action upon the rolls to. be'ground. The carrier 44 ex,- tends between the wheels 25 and 29 and is adapted to present rolls carried thereby to the substantially parallel portions of ,the

operative surfaces of the wheels 25 and 29,'

verse direction at a relatively low speed and 'serves to Acontrol or regulate the rate of' rotation of the rolls upon carrier 44 during the action of the grinding Wheel 29 thereon.

It will be understood that this action lof the abrasive wheels .upon the rolls is attained by reason of the operating surfaces of the wheels travelling'in opposite directions and that in the embodiment herein described, such travel of the operating surfaces in opposite directions is convenlently accomplished by the opposite rotations given the wheels. I may, however, also employ peripheral abrasive wheels rotating in the same direction for accomplishing the desired travel in opposite directions of the operating surfaces of the wheels such as are shown, for example, in my\ United States Patent #1,264,930 of May 7, 1918.

The carrier 44, present-in a cylindrical surface to the cylindrical ro ls 51, presents a path of contact for-the rolls which is substantiallya line and which forms substantially an element of the cylindrical surface. The travel of the rolls 51 along the carrier 44 and past the grinding wheel 29 and the regulating wheel 25 is .restricted by three paths of contact formed by the element of the cylindrical carrier 44 and by the two operating surfaces of the wheels 29 'and 25. During continuous operation and due tothe substantially continuous travel of the rolls along the carrier, as will be more clearly hereinafter described, that portion. of the carrier forming the path of contact with the rolls is subjected to wearso that the accuracy of operation, and hence ofthe grinding, is impaired. The carrier 44, however, in being rotatably mounted on the main frame 47, may be manually rotated throughout a sulicient extent to present anew element of its cylindrical surface for contact with the rolls to compensate for or avoid the bad effects of the Wear made in the previously used path of contact. Preferably the carrier 44 is made of hardened steel 'so as to reduce the wear thereon to a'minimum,

It will be noted that the Wear resulting upon the paths of. contact presented by the carrier 44 to the rolls 51 is due not only to the movement of the rolls in the direction of its axis but also to the relative movement of the surface of the rolls upon the carrier v 44 by reason of the regulating wheel 25 determining the rate of rotation of the rolls. In order to further minimize the wear on the carrie-r 44 and also to eliminate thefriction between the rolls and the carrier 44, a pulley 52 is provided upon'the ashaft ofthe cylindrical carrier 44 to perm1t the latter to be rotated at substantially the same surface speed as the surfacespeed of the rolls, andV hence to eliminate relative rotation between the two. The regulating wheel. 25 will give the roll 51, indicated in Figure 4, a rotation in the direction indicated by the .arrow 54, and the carrier 44 is rotated in the direction indicated by the arrow 63 at a rate; to substantially eliminate relative rotation between itself and the rolls, the pulley 52 being connected to any suitable source of power. -Thus the harmful effects of the 'fricf tion between the rolls 51 and the carrier 44 are reduced or substantially eliminated, thus eliminating also a great part of the wear on the carrier 44 and-'permitting a more'uni form and precise regulating action of the regulating wheel 25 as well 'as greater accuracy ofI grinding by -wheel Y 29. Further-` more, the rotation of the carrier 44 gives the rolls 51 a rotative vmovement prelimrna'rily of the rolls between the operative surfaces of to their being grip dbetween the wheels e 25 and 29 so'k that t e marking or injuring of the face of the rollsv is successfully eliminated. -Wherethe rolls are notgiven such a 4preliminary rotative movement, they are apt to be marred or injured by reason of the sudden` gripping'` thereof by the coact-ing'operative surfaces of the two wheels.k

.As has been hereinbcfore noted,the trave the wheels 254and-29 is restricted by three paths ,of contact. In order that the rolls may be automatically conveyed inwardly between the operating wheels, and in order also to vary .the rate of travel for a 'ven rate of driveof the operating wheels, pros vide means whereby the relative inclination between the path of contact of the rolls, on the carrier 44 and of the path of the operative surface of the regulating wheel 25 may be adjusted at will. This may be conveniently accomplished by pivotally mounting the frame member 47, as at 55, in a bracket 53,

adj ustably mounted as hereinafter described, a set screw 56A in the'- bracket 53 serving tolock the frame member 47 and its associated carrier 44 in any desired adjusted position.

loo

The rolls 51 or otherparts'operated upon are thus positively drawn inwardly betweenv the wheels25and 29 by the action of the regulating Wheel 25 resulting from the relative inclination givenlthe path. of its operative surface .with respect to the path of the 'rolls on the carrier.

Thefbracket 53 'is mounted on` a post 57,

referring to Figures 1 vand 2, slidably mounted at its lower end in the Ways 58 of a secondary frame member and isfadjustable in a vertical direction by means of the hand screw 59 rotatably mounted in the lower end of the frame and provided with collars 59 so as to prevent axial movement thereof. The secondary frame is in'turn mounted in ways 60 secured to the front part of the standard 10 of the machine and is movable Within the ways 60 by means of the hand screw I61, so that .the post 57 and hence the carrier 44, may be adjusted to- -Ward or away from the operative surface of either of the wheels.

A set screw 62 serves to lock the post 57 in its 'adjusted vertical position. The preferred' vertical` tadjustment of the post 57 and hence of th carrier 44 is such that the wheels 25 and 29 ywill operate upon the rolls in vpaths of contact therewith which are substantially. in a 'plane passing through the axesl of the 'wheels The preferred horizontal adjustment of the post 57 and 'its carrier 44 is, for a given size 'of roll, operated upon and hence for aA given relative adjustment of the carriage 30 with respect to the wheel 25, such that` thecarrier 44 occupies a substantially., central position between the op erative surfaces ofthe wheels 25 and 29.?

J may be made in the embodiment above set forth, it will ,be understood that all matter hereinbefore described and shown in the accompanying drawings is to be interpreted in an illustrative sense and not in a limited I claim as my invention: I j 1,. VIn roll grinding apparatus, in combination, a grinding wheel-adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adaptedto present operative surfaces travelling in opposite directions, a carrier of circular cross section for supporting a succession of rolls between the operative surfaces of said wheels and adapted to form a line of contact with said rolls, and means for mounting said carnation, a grinding wheel adapted to be ro-A `tated at a high speed and aregulating wheel adapted to be rotated at a'relatively low speed, said wheels being adapted to present operativesurfacestravelling in opposite directions, a carrier extending between said iso v wheel adapted to wheels, for supporting a cylindrical body in operative relation to said wheels, and means adapted to rotate said body 'preliminarily to its entry into operative relation to .said wheels. l

3. In roll grinding apparatus, in combination, a grindin wheel adapted to be rotated at a relative highspeed, a regulating lie rotated at a relatively low speed, said wheels being adapted tol present operative surfaces travellin in opposite directions, a carrier extending etween said wheels and having a` cylindrical surface forsupporting a roll in operative relation to said wheels, said roll being restricted in its travel by the three paths in which said roll conactswith said two wheels and said carrier, and means 'for adjusting the angular inclination between the path formed by said carrier and the path of travel of the operating surface of said regulating wheel wherebythe rate'o travel of said roll along said carrier is varied for a given rate of drive of said wheels.

4. In roll grinding apparatus,'in combii nation, a' grinding wheel adapted to be ro- 'tated at a relatively high speed, a regulating wheel adapted. to be rotated at a relatively-low speed, said wheels being adapted to present operative surfaces travelling in opposite' directions, and a carrier of circular cross section for supporting a succession of rolls in operative relation to saidwheels, one of the elements of said carrier forming a path of Contact with said rolls.

5.- In 'roll grinding apparatus, in combination, a grinding' wheel ada ted to be rotated at a relatively high spee a regulating wheel adapted to be rotated ata relatively low speed, said wheels being adapted to pre- .sent operative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality of rolls for silnultaneous action thereon and adapted to contact with said rolls in substantially an element thereof, means for rotatably supporting said carrier at its two ends to permit manual rotation thereof to present a new element for contact with said rolls, and means for adjusting said supporting means vertically with respect to `one of said wheels.

6; In roll grinding apparatus, in combination, a`- grinding wheel adapted to be rotated ata relatively high speed, a regulating -wheel adapted to'be rotated at a,relatively low speed, said wheels being adapted to present operativel surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting aplura-lity of rolls for simultaneous actionthereon and adapted tocontact with said 'rolls `in substantially an `element thereof,

, means adapted to permit adjustment of said carrier toward and away from the operating visite directions,

means adapted to a j a plurality of rolls for simultaneous action thereon and adapted to contact with said rollsv in substantially an element thereof, means adapted to permit said carrier to be adjusted vertically with respect to one of said wheels and means adapted to adjust said carrier toward and away from the operative surface of one of saidwheels.

[8. In roll grinding apparatus, incornbinatiorr, a grindin A tated at al relatively high speed, a regulating wheelyadapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality. of rolls for simultaneous action thereon, said-rolls contacting with said car'- rier vin substantially an element thereof, means for rotatively mounting said carrier high speed, a regulating wheel adapted to be ro- A between said wheels to permit manual rota- Y tion thereof to present a new element of concarrier adapted to guide rolls on said carrier to the operating surfaces of said wheels', and means adapte 'to receive said rolls from said carrier after operation thereupon by Said wheels.`

9. In roll tion, a grinding wheel adapted to be rotated at -a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, s aid wheels being adapted to present operative surfaces travelling in oppova cylindrical carrier extendingbetween said wheels for supporting a plurality of rolls for simultaneous action thereon, said rolls contacting with said carrier in substantiall. an` element thereof, st relatively the path .of contact of rolls on said carrier with respect to the path ofthe operative surface of said regulating wheel and thereby adjust the rate of feed of rolls along said carrier with a given rate of drive of said wheels, means adapted to guide the rolls on said carrier to the operating surfaces of said wheels, and means adapted to receive the rolls from said carrier after operation thereupon by rotated at a relatively high speed, a regugrinding apparatus, in combina-- n ravages f lating wheel adapted to be rotated at a relaaseries of rolls ino rative relationto said wheels, andpower riven means for effecting a rotary movement of said carrier.

11; In roll. grinding apparatus, in combination, a grindin wheel ada ted to be rotated at a relative high spec a regulating wheel adapted. to lie rotated at a relatively llow speed, said wheels being adapted to preroll l sent operative surfaces travelling in opposite directlons, means for presenting a support-1' lng surface for carrying a series of rol lating wheel substantially governing the rate. of rotation of said rolls, and'means for moving vsaid supporting surface in the same direction as and at substantially the same. speed as thesurface speed of said rotating 12. In roll grinding apparatus, in combination, a grinding wheel adapted to' be ro- (fated at a relatively -high speed, a regulatingv wheel adapted to be rotated at a relatively low speed, saidwheels being adapted to present operative surfaces travellin in opposite directions, a carrier extendin tween said wheels for 'supporting .a series of rolls in operative relation to said'wheels, said regulating wheel governing the rate of rotation of said rolls, and means for substantially eliminating frictipn between said rotating rolls and said carrier.

13. In a roll grinding apparatus, in combination,;aV grinding LWheel adapted to be rotated at a relatively high speed, a regulating wheels ada ted to be'rotated at a relatively low spee ,said wheels being adapted. to present operative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a pluralit of rolls in operative relation to said. whees, said rolls contactin with said cylindrical carrier in substanti y one ele- "mentf thereof, and continuously operative means for presenting-a new element of said l cyliliidical carrier for contacting withsaid y ro Y- 4 14.- Iny roll grinding,

apparatus, in combination, a grmdinj heel adapted wto 'be 'rotated at a relative y high-speed a regulating wheel adapted to be rotatedat a relatively low speed, said wheels being adapted to present `operative surfaces' travelling 1n opposite directions, a cylindrical carrier extending between said wheels for supporting a lurality of rolls in operative re ationv to said wheels, said rolls :contactin with said cylindrical carrier in .substantia -ly one element thereof, continuously operative means for presenting a new element of said cylindrical carrier for contacting with said rolls,

- s into: operative relation to said wheels, said Areguv present constantly a-new 'pivotally mounted frame or. rotatably supmeans associated with said carrier adapted to guide rolls on said carrier to the operating surfaces of said wheels, and means adapted to receive said rolls from said carrier after operation thereupon by said wheels.

"15. In roll grinding apparatus, in com. bination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces travelling in opposite directions, a carrier extending between said Wheels and having a cylindrical surface for supporting asuccessionof rolls in operativerelation to said wheels, said rolls contacting with said carrier in substantially one element of said cylindrical surface, a frame provided with a pair of bearings for rotatably supporting said carrier between said wheels, and means for continuously rotating said cylindrical carrier.

16. In Nroll grinding apparatus, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulatn ing wheel adapted to berotated at a relatively low speed, said wheels being adapted` to present operative surfaces travelling in opposite directions, a carrier extending between said wheels and having a cylindrical surface for supporting a roll in operative relation t0 said wheels, said roll being re: stricted in its travel hy thethree paths in which said roll contacts with said two wheels and said cylindrical surface, means forcentinuously rotating said carrier to resent continuously a new element thereo to form a new path of contact with said roll, and meansl for adjusting the angular inclination between the path ofv sald cylindrical surface -and the path of the operative surface of said regulating wheel. n

17. In roll grinding apparatus, in combination, a grinding wheel adapted to be rotatedat a relatively high speed, a regulating wheel adapted to lbe rotated ata relatively low speed, said wheels being adapted tof present operative surfaces travelling in opposite directions, a carrier of circular cross-section for Supporting a succession of rolls in operative relation to said wheels, one of the elements of said carrier forming 'apath of contact with said rolls, means for continuously rotating said carrier to porting said carrier topermit adjustment of lll ath of contact, a

the angular inclination thereof in a vertical is varied for a given rate of drive of said wheels, and means for locking said pivotal lmounting in adjusted position.

18.` In roll grinding apparatus, in combination, a grinding wheel adapted to be rotated `at a relatively high speed, a regulating wheel adapted to be rotated at a rela- -plane, whereby the rate of feed of said rolls tively low speed,said wheels` being adapted to present operative surfacestravelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality of rolls for a simultaneous action thereon and adapted to contact with j said rolls in substantially an element thereof, means for continuously rotating said carrier to present constantly a new element thereof for contact withv said rolls,` and means for adjusting and holding saidcarrier vertically withrespect to one of saidwheels.

`19. In roll grinding apparatus, in com'- bination, a grindingwheel adapted to be rotated at a relatively high speed, aregulat.- ing wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality of rolls for simultaneous action thereon and adapted to contact with said rolls in substantially an element thereof, means for continuouslyrotatingsaid carrier to present constantly a new element thereof for contact, with said rolls, means adapted to permit adjustment of said carrierv toward and awayfrom the .operating surface of one of said wheels, and means for' adjusting one of said Wheels toward and `from the 'operatingsurface of the other of said wheels.A

20. In roll grindin apparatus, in combination, a grinding w eel adapted to be rotated at arelatively high speed, a regulating wheel` adapted to be rotated at a relatively low speed, said wheels beingadapted j to --presentvperative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a 'plurality of rolls for simultaneous action thereon, v said rolls `contacting with said carrier 4in substantiallyl an element thereof, means ,for continuously rotating said carrier to present constantly a new element thereof for contact with said rolls,

means adapted to adjust relatively the path of contact of rolls on said` carrier with Qrespect to theA path of the operative surface of said regulating wheel and thereby adjust the rate of 'feed of rolls along said carrier with a given rate of drive of said wheels, meansa apted to guide the rolls on said carrier tothe operating surfaces of said wheels, and means ada ted to receive the rolls from said carrier a er operation thereupon by said wheels.

21'.`In 'roll grindin apparatus, in com bination, agrindin `w eel adapted to be rotatedat a relative y high speed, a regulating wheel adapted to be rotated at a relatively low speed, saidJ wheels being adapted to present operative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality of rolls for simultaneoiis action thereon, s aid rolls contacting with said carrier in substantially an element thereof, means for continuously rotating saidA carrierto present. constantlya new elementV thereof for contact with said rolls, a movable supporting lcarri-age adapted to be moved toward and away fromone of said wheels, means for mounting the other of said wheelswith its bearings upon said c movable'support and adapted to permit the adjustment of the operating surface 'of said wheel into substantial parallelism with the path of contact of said rolls of said carrier, and means for relatively adjusting the 'angularinclination of the `path of contact of said. carrier and the path of the operating surface of the other of said wheels, whereby the rate of feed of said rolls along said carrier is varied for a given rate of drive of said wheels.

22. In roll grinding apparatus, in ycombii nation, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adaptedto be rotated at a relatively low speed, said wheels being adapted to present operative surfaces travelling in opposite directions, a cylindrical carrier extend-` ing between said wheels fpr supporting a plurality of rolls for simultaneous action' thereon, said rolls contacting with said caroperating surface of said wheel into sub- 'stantial parallelism withthe path of contact of said rolls ofsaid carrier, and means for adjustlng sald carrier vertically with respect to one of said wheels.

23. In roll grinding apparatus, in combination,`a grindin wheeladapted tobe rotated at a relative y high speed, a regulating wheel adaptedl to be rotated at a relatively low speed, said wheels being adapted to pre-` sentfoperative surfaces travelling in opposite directions, a cylindrical carrier extending between said wheels for supporting a plurality of rolls for'simultaneous action thereon, said rolls cont-acting with said carrier' in substantially an element thereof, meansrfor continuously rotating said carrier Ato prefsent constantly a new element thereof for contact with said rolls, a movable supporting carriage adapted to be moved towardand away from one of said wheels, meansfor mounting the other of said wheels with its bearings upon said movable' support and adapted to permit the adjustment of the operating surface of said wheelinto substantial parallelism with 'the path of contact of said rolls of said carrier, means adapted to adjust said carrier vertically with respect to one of said wheels,4 and means adapted to adjust said carrler toward and away from the operatlve surface of oneof said wheels.

f acting therewith yi 24. In' roll grinding apparatus, in combination, a grinding wheel adapted to be ro-' tated at relatively high speed; and means coor rotating and supporting a succession of rolls in operativeI relation to said grinding'wheel, said means'in cluding a' member for supporting a succession of rolls and a member for holding the rolls thus supported against the grinding wheelsurface, one of said members being ro-` tatable and adapted to be driven at a relatively low speed and in adirection to present `ation thereon by said' grinding wheel, saidy means including' a-member for supportingl a succession of rolls and a member for holding the rolls thus supported' against .the v grinding wheel surface, one of said members being 'rotatable and adapted to be driven at a. relatively low-speed and in a direction to present an operative surface traveling in a direction opposite from that of the adjacent operative surface of said grinding wheel, and said rotatable member being ex' tended beyond the operative face of the grinding wheel, thereby to ca'use a Arotationv of said rolls preliminary to their entry into operative relation to said grinding wheel.

26. In a machine for grinding work of round section, a grinding throat, in which Work of round section is received for simultaneous grinding and rotation, including, in combination, a grinding-wheel rotatable at relatively high Kspeed, a rotatable memberadapted to be driven ata surface speed relatively lowand substantially equivalent to the surface speed of the work and in a direction to present ,an operative surface traveling in a direction `opposite from that 'l i of the adjacent operative surface of said grinding wheel', said member being extended beyond theoperative face of said grinding wheel to cause a rotation of the work preliminary tov its entry into the grinding throat, and means adapted to prevent lat eral displacement of the work while inoperativerelation to said grinding wheel.

In .testimony whereof, I have signed my yLEWIS R. HEIM.

:name to this specification this eleventh day of December, 1920. 

